springboot内嵌flink并对外部的flink集群通信

为了在Spring Boot应用程序中嵌入Flink并与外部Flink集群通信，可以使用Flink的REST API。以下是实现此目的的步骤：

1.在Spring Boot项目中添加以下依赖项：

<dependency>
    <groupId>org.apache.flink</groupId>
    <artifactId>flink-clients_2.11</artifactId>
    <version>${flink.version}</version>
</dependency>

2.在Spring Boot应用程序中创建一个Flink客户端：

@Configuration
public class FlinkConfig {

    @Value("${flink.rest-url}")
    private String restUrl;

    @Bean
    public StreamExecutionEnvironment streamExecutionEnvironment() throws Exception {
        final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
        env.setParallelism(1);
        env.getConfig().disableSysoutLogging();
        env.getConfig().setRestartStrategy(RestartStrategies.fixedDelayRestart(4, Time.seconds(10)));
        env.getConfig().setGlobalJobParameters(getGlobalJobParameters());
        env.setStreamTimeCharacteristic(TimeCharacteristic.EventTime);
        env.enableCheckpointing(5000);
        env.getCheckpointConfig().setCheckpointingMode(CheckpointingMode.EXACTLY_ONCE);
        env.getCheckpointConfig().setMinPauseBetweenCheckpoints(500);
        env.getCheckpointConfig().setCheckpointTimeout(60000);
        env.getCheckpointConfig().setMaxConcurrentCheckpoints(1);
        env.getCheckpointConfig().enableExternalizedCheckpoints(CheckpointConfig.ExternalizedCheckpointCleanup.RETAIN_ON_CANCELLATION);
        env.setStateBackend((StateBackend) new FsStateBackend("file:///tmp/checkpoints"));
        return env;
    }

    @Bean
    public FlinkRestClient flinkRestClient() {
        return new FlinkRestClient(restUrl);
    }

    @Bean
    public Configuration getGlobalJobParameters() {
        final Configuration conf = new Configuration();
        conf.setString("rest.url", restUrl);
        return conf;
    }
}

3.在应用程序中使用Flink客户端与外部Flink集群通信：

@RestController
@RequestMapping("/flink")
public class FlinkController {

    @Autowired
    private FlinkRestClient flinkRestClient;

    @GetMapping("/jobs")
    public List<JobStatusMessage> getJobs() throws Exception {
        return flinkRestClient.listJobs();
    }

    @PostMapping("/jobs")
    public JobSubmitResponseBody submitJob(@RequestBody JobSubmitRequestBody jobSubmitRequestBody) throws Exception {
        return flinkRestClient.submitJob(jobSubmitRequestBody);
    }

    @GetMapping("/jobs/{jobId}")
    public JobDetailsInfo getJobDetails(@PathVariable String jobId) throws Exception {
        return flinkRestClient.getJobDetails(jobId);
    }

    @GetMapping("/jobs/{jobId}/exceptions")
    public List<ExceptionInfo> getJobExceptions(@PathVariable String jobId) throws Exception {
        return flinkRestClient.getJobExceptions(jobId);
    }
}

在上面的代码中，我们使用Flink REST API获取Flink作业的列表，提交Flink作业，获取Flink作业的详细信息以及获取Flink作业的异常信息。